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INDI Library v1.8.1 Released (09 Sep 2019)

Monthly maintenance release INDI v1.8.1

Alignment starts before mount is finished slewing

1 month 2 days ago 1 month 2 days ago by Ihoujin.
Ihoujin
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Alignment starts before mount is finished slewing #45516
Maybe it is reporting a trigger signal, for lack of a better term, for each axis, one for RA, and another for DEC?

INDI/KStars on Raspberry Pi 4, 4gb
Raspbian Buster with AstroPi3 script configuration
Skywatcher HEQ5 Pro Mount
Canon 600D Camera
Orion SSAG/ASI120mm @280mm Guide Scope
PHD2
Adafruit Motor Hat shield
Adafruit GPS Module
Generic Bluetooth Joystick.
Startech 7 port powered USB Hub.

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3 weeks 6 days ago
mpfjr
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Alignment starts before mount is finished slewing #45722
Just poking.
Any further clues, hints or ideas on going forward fixing this issue?

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3 weeks 1 day ago
sterne-jaeger
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Alignment starts before mount is finished slewing #45897
Still under investigation, since it is not that easy to reproduce with Simulators. Meanwhile the best explanation I see is, that this is a concurrency issue where a slew command overtakes a sync command. It looks like a sync happens while the mount already has started to slew.

You could reproduce a similar situation using the model builder of the align module:
  1. Create a set of alignment points with the mount model tool
  2. Start the mount model routine and let the first position being resolved.
  3. Wait until the mount slews to the second position.
  4. While slewing, use the INDI dialog and sync the mount to the first position.
  5. Observe, that capturing immediately starts although the mount is still slewing

What I could not explain right now is, why the sync command is overtaken by a slew.

- Wolfgang

TSA-120 + FSQ-85 + GSO 150/750 | Avalon Linear + M-zero | Moravian G2-8300 + ASI 1600mm pro + ASI 294mc pro | KStars/INDI on Raspberry Pi 4 with Raspbian 10
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